condition mean min max ZT0-3 10.932695 10.211385 11.59735 ZT4-7 22.19995 22.19995 22.19995 ZT8-11 46.67165 46.67165 46.67165 ZT12-15 73.60395000000001 68.85865000000001 78.34925000000001 ZT16-19 37.46085 37.46085 37.46085 ZT20-23 17.1482 17.1482 17.1482